Composition of color-filter or absorbing-screen for artificial light



M. LUCKIESH AND D. A. DEWEY. COMPOSITION OF COLOR FILTER OR ABSORBING-SCREEN FOR ARTIFICIAL LIGHT.

APPLICATION FILED AUG- 2!. I9I5- RENEWED NOV. 29. I919.

Patented Feb. 24,1920.

Invento S81E95 KnesIq 0r1 Dewgy L ThIrzqitoffio y.

a 9 integral glass color screen which is substantially homogeneous throughout.

unmansnares ATEN F E Kerr LUCKIESH corrrosrrron or coma-FILTER on Aesomame-scnm'n' FOR eminent mam.

AND DON A. DEWEY,- OI CLEVELAND, OHIO, ASSIGNOBS TO GENERAL ELECTRIC COMPANY, CORPORATION OEIIEW YORK,

Application flled.,August 21, 1915, Ser1al 80. 46,737.

Toall whom it may concern: I 1 Be it known that we, MATT Looxmsn and DoN A. DEWEY, citizens of the United States, residing at Cleveland,- in the county of Cuyahoga, State 'of Ohio, have invented useful Improvements in Composition of Color-Filters or Absorbing- Screens for Artifical Light, of which. the following is a specification. w

Our invention relates to color filters or absorbing screens adapted to be used in con- .nection with artifical light 'for the purpose of producing-an approximation to what is known as daylight, Mpre particularly our invention relates to means which may be used. n connection with electric lamps, particularly electric incandescent lamps, to

. produce this result.-

Heret'ofore it has been attempted to produce an integral glass which would serve as a, color filter to. roduce-an 'approximation to daylight. owever, these attempts were unsuccessful and recourse was then had to the-use offsuperposed screens. The superposed glass screen, however, is at tended with considerable disadvantages. I

is expensive and cumbersomelalfd the num fiber of shapes inwhich it can be utilized is unduly restricted. In yiew of the fact that it is necessary to combine several screens, the thickness of the screen as a whole must be considerable, andthis causes undue absorption of light.

Accordlng to, the present, invention, the gsodax daylight effect is produced by means of an filters or screens of 'thischaracter are obviated, and at the same time a closer ap-x.

proximat'ion todaylight is obtained than those obtained by previous attempts in this i Y direction. P

'In'the 'drawing'are shown two examples of devices I incorporating our invention. Figure 1 is'an elevation, partly insection,

of a combination lamp and shade embody ing our invention; Fig. 2 is an elevationof an electric incandescent lamp the bulb of which is composed of glass embodying our t 1 fi;

Specification of Letters Patent.

' proximate more cl Patented Feb, 24,1920.

Renewed November 29, '1919, Serial No. 844,469.

invention. Fig. 3 is a section of a piece of 'glass'embodying our invention. J

'filed April51'9, 1913. Lamps of this type have a highiefiiciency, and for this reason the color filter may be used in connection therewith with especial economy.

In Fig.1, 10 is a lamp such as is described hereinbefore referred to. r 11 is a reflector which may be of any well-known character. The mouth of,the said reflector is. closed by a color filter 12 composed of glass made according toour invention; Any suitable fastening, such 513, may be provided to hold the screen or filter in position.

L In Fig. 2 is shown an incandescentlamp of the type described in the Langmuir and Orange 'alfiplications hereiribefore referred to, the b b 14 of which is composed of glass embodying our invention, The in corporation of this glass -in the lamp itself affords, a very convenientpan'd economical method of applying ourinventiomsince a lamp comprising suc a bulb may be im sertediin any fixture.

I The following is an example" (if va batch.

ivhichmaybe used to produce our glass.

Sand 1,500- lbs.

I 535 lbs. Lime .1. 160 lbs. Niter lbs. Arsenic 5 lbs. Manganese dioxid' 3 lbs. Cupric oxid a 5% ,lbs. Black oxid of cobalt, -1; lbs

This batch resultsin a-glass which is bluish in color but which has a slight greenish tinge. When a glass of this character is u in connection with a gas-filled lamp ofthetype ,herein-betore referred, to at very close app ox-imation to various kinds of daylight is ob ained, depending upon the thic ness of the glass. 1 t

In certaincases it may bedesirable to ap ly to skylight, and for in theLangmuir and Orange applications mula given above.

Vitrifiable carmine grams Vitrifiable blue 2% grams VitrifiablefluX 30 grams These substances are known commercially as carmine No. 45, blue No. 245 and flux No. 10. The application of this mixture to the surface of the glass and the heating to a high temperature results in a transparent purplish glaze which is integrally united with the body of the glass. In Fig. 3 is shown a section ofthe glass in which the portion 15 is made according to the daylight glass formula given. above and the portion 16 presents the glaze Which has been described.

In certain cases it has been found desirable to somewhat decrease the proportion of black oxid of cobalt as contained in the for- This has been done in cases where it is necessary to decrease the heat efi'ect caused by a large proportion of the green element. This may bedone to a certain extent Without affecting substantially the daylight qualities of the glass.

It will be obvious that the proportions as stated above may be somewhat varied Without departing from the spirit of the invention, the scope of which is stated in the following claims.

hat we claim as new and desire to secure by Letters Patent of the United States, is

1. In a batch for making a color filter or absorbing screen for transforming the light of artificial illuminants to daylight character, aglass .mixture containing manganese, copper and cobalt oxids in substantially the proportion of one part manganese dioxid to two parts copper and cobalt oxids.

2. A batch for making color filters or absorbing 'screens for transforming the light of artificialilluminants to daylight character containing substantially 2250 parts of a mixture capable of producing a clear glass and 9 partsof a mixture of manganese, copper and cobalt oxids.

3. In a batch for making color filters or absorbing screens for transforming the light of artificial illuminants to daylight character a glass mixture containing manganese, copper and cobalt oxids in substantially the proportions of 12 manganese dioxid, 22

nants to daylight character, comprising a glass of a composition containing substantially 7.6 parts manganese, 25 parts copper and 1 part cobalt.

6. A color filter or absorbin screen for transforming the light of arti cial illumi- ,nants to daylight character, comprising a glass of a composition containing substantially 1 part cobalt and 7.6 parts manganese.

7. A color filter or absorbin screen for transforming the light of artificial illuminants to daylight character, comprising a glass composition containing substantially 1 part cobalt and 25 parts copper.

8. A glass for transforming the light of artificial illumi'nants to that having daylight character comprising constituents ordinarily found in clear glass, and copper, cobalt and manganese compounds in the proportion to give said glass a bluish color.

9. A bluish glass for use to produce daylight eflects containing copper and manga-- nese.

10. A bluish glass for use to produce daylight efi'ects containing copper, manganese and cobalt.

In witness whereof We have hereunto set our hands this 18th day of August, 1915.

MATT LUCKIESH. DON A. DEWEY. 

